One year between b19 and b20. 4 days between b20 and b21...

This new version of Clon introduces support for a new compiler, Allegro Common Lisp, in both standard and modern form. Support for dumping is only rudimentary for ACL (although it's only a marginal feature of the library). The dump macro uses Allegro's dumplisp mechanism to dump a lisp image which is not directly executable (full application delivery is complicated and only available in the Enterprise edition). Apart from that, the rest should work fine. As in the case of CLISP, Allegro may benefit from the presence of CFFI in order to provide terminal autodetection. This is an optional dependency only.

Grab it at the usual place.